Jack and Sally sets consist of 2 x 50g variegated skeins - one in blues, green, pink, orange and yellow, and the other in black and white.
The yarn is 75% superwash merino/25% nylon sock yarn - 212m/231yds per 50g (425m/467yds per set).
If using both skeins for the same project, it may be advisable to swatch the two different skeins to be sure that your gauge is the same with both - on occasion different dyes and dyeing techniques can affect yarn.